Two teaching experiments were conducted and a big-sample questionnaire was carried out to test its efficiency.

在实践中进行了两次教学实验，同时进行了大样本的问卷调查，检验其效度。

youdao

Two teaching experiments were conducted and a big-sample questionnaire was carried out to test its efficiency.

在实践中进行了两次教学实验，同时进行了大样本的问卷调查，检验其效度。

youdao